Developing solid-state hydrogen storage materials is as pressing ever, which requires a comprehensive understanding of the dehydrogenation chemistry hydride. Transition state search and kinetics calculations are essential to designing high-performance by filling in knowledge gap that current experimental techniques cannot measure. However, ab initio analysis these processes computationally expensive time-consuming. Searching for descriptors accurately predict energy barrier urgently needed,...

Phasor measurement units (PMUs) are taking an increasingly important role in power system dynamic security monitoring and control. However, traditional discrete Fourier transforms (DFTs) used by PMUs cannot obtain accurate phasor measurements during frequency excursion transient events, being limited its static model. In this paper, a synchrophasor estimation algorithm for M-class based on the model is proposed. algorithm, within observation data window approximated second-order Taylor...

Data quality issues exist in practical phasor measurement units (PMUs) due to communication errors or signal interferences. As a result, the performances of existing data-driven disturbance classification methods can be significantly affected. In this article, fast method that is robust PMU data proposed. The impacts bad measurements on are investigated by analyzing feature distributions deep learning methods. A new extraction scheme uses univariate temporal convolutional denoising...

Phasor measurement units (PMUs) can provide real-time data to construct the ubiquitous electric of Internet Things. However, due complex factors on site, PMU be easily compromised by interference or synchronization jitter. It will lead various levels quality issues, which directly affect PMU-based application and even threaten safety power systems. In order improve quality, a data-driven bad detection algorithm based spectral clustering using single is proposed in this paper. The does not...

Accurate and fast event identification in power systems is critical for taking timely controls to avoid instability. In this paper, a synchrophasor measurement-based robust method proposed considering different penetration levels of renewable energy. A difference Teager-Kaiser energy operator (dTKEO)-based algorithm first improve multiple-events detection accuracy. Then, feature extractions via the integrated additive angular margin (AAM) loss long short-term memory (LSTM) network are...

Electrochemical reactions occur on the surface of electrode, so electrode modifications are essential for redox flow batteries (RFBs). Major works regarding focus traditional RFBs like vanadium systems, but minor stress organic that represent a rapidly developed technology large-scale energy storage. In this work, we employ thermal oxidation (600 °C) and investigate effect heating time polyacrylonitrile-based carbon felt used in 2,6-dihydroxyanthraquinone (2,6-DHAQ)/K4Fe(CN)6 RFBs. The...

The popularization of electric vehicles (EVs) and charging stations has been threatening the distribution network's reliability efficiency. prediction EV demand can benefit optimization operation energy-transportation nexus improve social welfare toward a low carbon future. In this article, short-term probabilistic forecast model is proposed to estimate quantiles future station 15 min ahead, i.e., self-attention-based machine theory mind (SAMToM). SAMToM considered both users' historical...

Energy storage is an important technical means to increase the consumption of renewable energy and reduce greenhouse gas emissions. Electrochemical storage, represented by lithium-ion batteries, has a promising developmental prospect. The performance batteries continues decline in process application, differences between are increasing. Therefore, accurate estimation state health (SOH) key safe efficient operation systems. In this paper, electrochemical impedance spectroscopy (EIS)...

Efficient perovskite/organic integrated solar cells with enhanced near-infrared light utilization were demonstrated.

Phasor measurement units (PMUs) are one of the most effective devices for measuring power system dynamics, and it is critically important that they have good performance. This paper proposes a high-accuracy synchrophasor estimation algorithm builds PMU calibrator to offer reference values test calibration in laboratory. Based on general signal-fitting model, nonlinear-fitting-based phasor frequency using an iterative solution proposed. A rate-of-change-of-frequency (ROCOF) method filter...

With the increasing development of renewable energy and high-voltage direct current (HVDC) transmission technology, integration power electronics-interfaced components has caused sub-/super-synchronous inter-harmonics into signals, yielding subsynchronous oscillations (SSOs). Online monitoring identification SSOs are crucial to secure stable operation systems. This paper proposes a data driven method using realistic phasor measurement unit (PMU) data. Three features extracted via analysis...

Abstract Interface engineering plays a vital role in the further improvement of efficiency and stability for organic solar cells (OSCs). Herein, self‐assembly metal chelate based on hafnium designed ligand, N‐(4‐(3‐oxobutanoyl)phenyl)acetamide (ACBN) is applied as both interfacial modification layer UV‐light filter OSCs. The strong hydrogen‐bond induced intermolecular interaction enables Hf(ACBN) 4 with prerequisite adequate solvent resistance to work an electron transport (ETL) inverted...

Accurate and rapid identification of distribution system fault causes is essential for power reliability enhancement. Manual cause requires extensive human resources that leads to extended outage time. To this end, paper proposes a dual-channel convolutional neural network (DC-CNN)-based method using realistic data from waveform measurement units. The mechanism characteristics different are investigated by analyzing large amounts field data. short-time Fourier transform (STFT) advocated...

The dynamic behavior of phasor measurement units (PMUs) is not only the key point to algorithm improvement but also basis for successful implementation PMUs in power system security monitoring and control. In this paper, performance evaluated, their behaviors are analyzed. from four largest Chinese manufacturers tested through established PMU test system, comprehensively evaluated. Analysis shows that spectral leakage averaging effect discrete Fourier transform (DFT) under conditions reasons...

Phasor measurement units (PMU) are playing an increasingly important role in power system dynamic security monitoring and control. However, the wide-area deployments of renewable energy sources high voltage direct current (HVDC) transmission bring a large number inter-harmonics to grid, which may result further problems. The impacts on synchrophasor measurements revealed. This paper derives phasor expressions signal, contains fundamental component inter-harmonics. It is found that will lead...

The dynamic characteristics of power systems have become increasingly complex with the growing application electronics equipment. A high level real-time monitoring is now required to provide a database for system stability and safety control. Therefore, flexible accurate sensor technology crucial. In this article, noncontact current sensing method proposed using tunnel magnetoresistance (TMR) technology. Based on introduction TMR chip characteristics, law surrounding current-carrying wire...

Distributed detection and acoustic emission (AE) waveform retrieval of partial discharge (PD) in power cable joints are significant but challenging tasks. In this article, we proposed a joint PD method based on optical fiber distributed sensing (DAS). Ordinary single-mode (SMF) was wound the outer semiconductive layer to obtain sufficient sensitivity. Coherent time domain reflection (COTDR) principle utilized detect phase variation locate PDs. The AE waveforms were retrieved by Fourier...